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5 pin DIN male схематический вид разъема
5 pin DIN male разъем
at the 1st peripheral
5 pin DIN male схематический вид разъема
5 pin DIN male разъем
at the 1st peripheral
Signal 1st 2nd
Shield 2 2
Current Source 4 4
Current Sink 5 5

Comments:

Pin 2 should not be connected at both ends, the whole point of MIDI using opto-isolators is to avoid earth loops caused by having individual synths earthed at more than one point -- through the audio cable and again through the MIDI cable.

For _cables_, pin 2 should be connected to the shiedling of the wire on both ends - the jacks on the instrument side deal with the connect / dont connect issue. The shell of the plugs, on the other hand, should _not_ be connected to the shielding.

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regarding disconnecting the earth at one end, this is a common bad practice. also an earth loop is not formed by connecting 2 devices at multiple points, that is a total misunderstanding of the concept of earth loops. in fact the best practice is to create a combination mesh and star earth using an earth bus and as many earth connections in between interconnected devices as possible.
 
disconnecting the earth where you have bad earthing will help to avoid coupling (capacitively within the cable) the earth circuit related noise (hum and buzz) with the midi signal, but this is a bandaid solution. at the same time keep in mind you will increase the amount of rfi coupled to the midi signal. but yes due to the optoiscolators, this should not be a problem. but it should be correctly understood.

 
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